TY - JOUR
T1 - Attenuation of urinary sodium excretion during cold-air exposure in trained athletes
AU - Yoshida, Tetsuya
AU - Nagashima, Kei
AU - Nakai, Seiichi
AU - Yorimoto, Akira
AU - Kawabata, Takashi
AU - Morimoto, Taketoshi
N1 - Copyright:
Copyright 2015 Elsevier B.V., All rights reserved.
PY - 1999/4
Y1 - 1999/4
N2 - To clarify whether an increase in urinary sodium (Na) excretion during cold-air exposure is attenuated in trained athletes, we analyzed the urinary and hormonal responses to cold-air exposure at 15°C in trained (TR, n=9) and untrained men (UT, n=9). During 15°C exposure in the UT group, the urinary Na excretion (U(Na)V), fractional excretion of Na and urinary Na to K ratio (U(Na/K)) increased significantly (p<0 01-0.05), but there were no variations in creatinine clearance or the filtered Na load. In the TR group, however, no significant changes were demonstrated in these parameters. The amount of increase in plasma noradrenaline and of decrease in plasma volume were greater, and the ADH and adrenaline responses were smaller in the TR group than those found in the UT group during 15°C air exposure. A significant positive correlation was demonstrated between the increase of U(Na)V and both the relative changes of U(Na/K) and mean blood pressure. These results indicated that natriuresis during cold-air exposure was induced by the decrease in tubular reabsorption of Na, and that natriuresis was attenuated in trained athletes.
AB - To clarify whether an increase in urinary sodium (Na) excretion during cold-air exposure is attenuated in trained athletes, we analyzed the urinary and hormonal responses to cold-air exposure at 15°C in trained (TR, n=9) and untrained men (UT, n=9). During 15°C exposure in the UT group, the urinary Na excretion (U(Na)V), fractional excretion of Na and urinary Na to K ratio (U(Na/K)) increased significantly (p<0 01-0.05), but there were no variations in creatinine clearance or the filtered Na load. In the TR group, however, no significant changes were demonstrated in these parameters. The amount of increase in plasma noradrenaline and of decrease in plasma volume were greater, and the ADH and adrenaline responses were smaller in the TR group than those found in the UT group during 15°C air exposure. A significant positive correlation was demonstrated between the increase of U(Na)V and both the relative changes of U(Na/K) and mean blood pressure. These results indicated that natriuresis during cold-air exposure was induced by the decrease in tubular reabsorption of Na, and that natriuresis was attenuated in trained athletes.
KW - Baroreceptor
KW - Natriuresis
KW - Volume-regulating reflex
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U2 - 10.2170/jjphysiol.49.193
DO - 10.2170/jjphysiol.49.193
M3 - Article
C2 - 10393354
AN - SCOPUS:0032984345
VL - 49
SP - 193
EP - 199
JO - Journal of Physiological Sciences
JF - Journal of Physiological Sciences
SN - 1880-6546
IS - 2
ER -